A race bmw 316, m10, s14, m20, turbo, na, its been the lot!

[Graham]

Re: A racing bmw 316, 240bhp Atmo M10

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How comes you had trouble with your glasses Graham?

it was cold! they steam up in cold weather the bigger the corner and the more i brake the worse the get so i must breath heavier under such conditions, i can race without them as im long sighted (though its not good for reading gauges) but i have to take them off a good while before the race to let my eyes adjust.

race one which i dnf'd was ok because it was warmer

[Retromotorsport]

Re: A racing bmw 316, 240bhp Atmo M10

Lots of good stuff going on as normal Graham, re the glasses, Fog Ex ?

Or the more painfull ( i'd imagine) version i saw once, tank tape across the face and helmet rim, so all air expelled went downwards as the nose and mouth was sealed. I never saw the guy take the tape off, so dont know if it hurt.. so if you do do it, dont chase me around the paddock

[robt100]

Re: A racing bmw 316, 240bhp Atmo M10

With the injectors, would it not be easier to move the injectors closer to the trumpets? Putting the tip of the injector in line with the end of the trumpet would take away any issue of the spray being blown off course surely?

[stephen bahr]

Re: A racing bmw 316, 240bhp Atmo M10

With the injectors, would it not be easier to move the injectors closer to the trumpets? Putting the tip of the injector in line with the end of the trumpet would take away any issue of the spray being blown off course surely?

in theory yes, but i doubt that the fuel would atomise so well, and mix with the air to the same extent.

[david_white]

Re: A racing bmw 316, 240bhp Atmo M10

You could always get one of those impact helmets like Pig has, although I suspect fog-x is slightly cheaper

[Graham]

Re: A racing bmw 316, 240bhp Atmo M10

in theory yes, but i doubt that the fuel would atomise so well, and mix with the air to the same extent.

couldnt of put it better myself, i also dint want the injectors theemselves messing up the airflow around the trumpets if i were to just fit them very close to the edge, actually attaching them to the trumpets themselves would of needed more fabrication,

there are a number (mainly us based) sports and gt cars the ran with injectors actually spraying the fuel upsteam towards the open end of the trumpet to get better atomisation, so i sort of have a halfway house

[Dan]

Re: A racing bmw 316, 240bhp Atmo M10

on my way home last night i stopped in the ferrari store, theyve got both the F1 car and engine from 2004 on display... the engine has a carbon airbox on and where the intake would come in the top they'd put a clear panel in so you could see the injectors and trumpets.... i'll try and take a picture altho the security were quite keen.

there might well have been an injector further down although i couldnt see one, but i guess at 12-18k rpm you dont need the lower ones... the injectors i could see looked like they sat with the nozzle just inside the trumpet. they were alloy and shaped like a tap. difficult to explain but they came in over from the side a fair bit away from the trumpet and then down in the middle maybe 20mm. probably a complete b'tard to make but not impossible.

great results for the year tho Graham, to have changed the car so much and it give you the exact kind of racing you were after is some good going

[mervhill]

Re: A racing bmw 316, 240bhp Atmo M10

The F1 versions are actually very clever. They are variable. The injectors actually change their position relative to the inlet based on RPM, the higher it is the further away they get.

[Dan]

Re: A racing bmw 316, 240bhp Atmo M10

The F1 versions are actually very clever. They are variable. The injectors actually change their position relative to the inlet based on RPM, the higher it is the further away they get.

i'll have to have a closer look next time i pass by then they dont half sell some overpriced tat in there though

[angliaant]

Re: A racing bmw 316, 240bhp Atmo M10

im genna get me a bike altenator

[robt100]

Re: A racing bmw 316, 240bhp Atmo M10

couldnt of put it better myself, i also dint want the injectors theemselves messing up the airflow around the trumpets if i were to just fit them very close to the edge, actually attaching them to the trumpets themselves would of needed more fabrication,

there are a number (mainly us based) sports and gt cars the ran with injectors actually spraying the fuel upsteam towards the open end of the trumpet to get better atomisation, so i sort of have a halfway house

Surely it wouldnt affect the airflow as much as that halfords sign you used!

[team_zi]

Re: A racing bmw 316, 240bhp Atmo M10

Graham, do you run full or open face helmet? Maybe open face would prevent glasses steaming, or are full face helmets mandatory?

I suffer the same problems, and run full face. I cant see past the ends of my arms without my glasses on though, so taking them off aint a good idea.

I notice some hillclimbers use open face, but again, regs dont make one or the other mandatory.

[Graham]

Re: A racing bmw 316, 240bhp Atmo M10

i wear a full face lid, i dont have to, but being a motoircyclist i dont feel comfortable with an open face, but seeing as my helmet will be out of date next year i might replace it with an openface one, and save a bit of weight into the bargin.

i might also get somw contact lens just for use in poor weather

[robt100]

Re: A racing bmw 316, 240bhp Atmo M10

i might also get somw contact lens just for use in poor weather

well itll save more weight!

[mrjimbo]

Re: A racing bmw 316, 240bhp Atmo M10

Or the more painfull ( i'd imagine) version i saw once, tank tape across the face and helmet rim, so all air expelled went downwards as the nose and mouth was sealed. I never saw the guy take the tape off, so dont know if it hurt.. so if you do do it, dont chase me around the paddock


The tank tape will be fine, by the time you need to take it off the warmth and moisture from your face has softened the adhesive and it pulls off easily.
I use this method myself when it's wet or damp and not had any problems with it

If you have a vent on the chin bar make sure that it's open other wise when you get back to the paddock it'll look like your dribbling as the condensation will run down your chin as the outward breath can't get out quickly enough